Battery charger



FIG. 1 is a front, right and top perspective view of a battery charger, showing my new design;

FIG. 2 is a rear, left and bottom perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is an enlarged top plan view thereof; and,

FIG. 8 is an enlarged bottom plan view thereof.

The broken lines shown in the drawings illustrate portions of the battery charger that form no part of the claimed design. 

CLAIM The ornamental design for a battery charger, as shown and described. 